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在急慢性输血后肝炎、散发性肝炎及爆发性肝炎中，有相当比例的患者用现有甲、乙、丙、丁、戊、庚型肝炎实验室诊断方法尚不能分型，在排除已知的致病因素外，仍有３．５０～１５％的肝炎病人病因不明。通常将这些不明原因的肝炎称之为非甲－庚型肝炎。１９９７年日本学者报道?
In the acute and chronic post-transfusion hepatitis, sporadic hepatitis and fulminant hepatitis, a considerable proportion of patients with the existing A, B, C, D, E and G hepatitis laboratory diagnostic methods can not type, in the exclusion of known Of the pathogenic factors, there are still 3.50 ~ 15% of hepatitis patients etiology is unknown. These unknown causes of hepatitis are often referred to as non-A-Hepatitis. Japanese scholars in 1997 reported?